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require_relative '../../spec_helper'
describe "Fiber.yield" do
it "passes control to the Fiber's caller" do
step = 0
fiber = Fiber.new { step = 1; Fiber.yield; step = 2; Fiber.yield; step = 3 }
fiber.resume
step.should == 1
fiber.resume
step.should == 2
end
it "returns its arguments to the caller" do
fiber = Fiber.new { true; Fiber.yield :glark; true }
fiber.resume.should == :glark
fiber.resume
end
it "returns nil to the caller if given no arguments" do
fiber = Fiber.new { true; Fiber.yield; true }
fiber.resume.should be_nil
fiber.resume
end
it "returns to the Fiber the value of the #resume call that invoked it" do
fiber = Fiber.new { Fiber.yield.should == :caller }
fiber.resume
fiber.resume :caller
end
it "does not propagate or reraise a rescued exception" do
fiber = Fiber.new do
begin
raise "an error in a Fiber"
rescue
Fiber.yield :first
end
:second
end
fiber.resume.should == :first
fiber.resume.should == :second
end
it "raises a FiberError if called from the root Fiber" do
->{ Fiber.yield }.should raise_error(FiberError)
end
end
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